<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>Document</title>
  </head>
  <body>
    <script>
      function Person() { }
      console.log(Person.constructor === Function);         // 输出结果：true
      console.log(Function.constructor === Function);       // 输出结果：true

      console.log(Function.prototype === Object.__proto__); // 输出结果：true
    </script>
  </body>
</html>